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A019348 Primes with primitive root 21. 2
2, 19, 23, 29, 31, 53, 71, 97, 103, 107, 113, 137, 139, 149, 157, 179, 181, 191, 197, 223, 233, 239, 263, 271, 281, 307, 313, 317, 347, 359, 389, 397, 401, 409, 431, 443, 449, 491, 523, 557, 569, 577, 607, 619, 643, 653, 659, 683, 701, 727, 733, 743, 769, 787, 809, 811 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Index entries for primes by primitive root

MATHEMATICA

pr=21; Select[Prime[Range[200]], MultiplicativeOrder[pr, # ] == #-1 &]

CROSSREFS

Sequence in context: A041451 A268492 A130112 * A155025 A191068 A069690

Adjacent sequences:  A019345 A019346 A019347 * A019349 A019350 A019351

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified December 2 21:20 EST 2016. Contains 278694 sequences.